linux-kernel - [Kernel 5.1] ACPI_DEBUG messages without CONFIG_ACPI

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Date:   Tue, 7 May 2019 01:34:28 +0200
From:   Gabriel C <nix.or.die@...il.com>
To:     linux-acpi@...r.kernel.org
Cc:     LKML <linux-kernel@...r.kernel.org>
Subject: [Kernel 5.1] ACPI_DEBUG messages without CONFIG_ACPI_DEBUG being set

Hello,

while testing kernel-5.1 I get on one of my Lenovo Laptops very
strange 'ACPI Debug:' messages.

After some grepping I realized these are Debug messages from DSDT ,
however my kernel does
not have ACPI_DEBUG enabled.

I found out the module triggering this, on this Laptop is
ideapad_laptop , but looking at the code
I cannot see what would causes that.

Also on the same Laptop with any 5.0.X kernels I cannot see these.


~$ grep -i ACPI_DEBUG /boot/config-5.1-fw1
# CONFIG_ACPI_DEBUGGER is not set
# CONFIG_ACPI_DEBUG is not set
# CONFIG_THINKPAD_ACPI_DEBUGFACILITIES is not set
# CONFIG_THINKPAD_ACPI_DEBUG is not set

.. dmesg ..
...
[   68.020812] calling  ideapad_acpi_driver_init+0x0/0x1000
[ideapad_laptop] @ 1322
[   68.026708] input: Ideapad extra buttons as
/devices/pci0000:00/0000:00:1f.0/PNP0C09:00/VPC2004:00/input/input16
[   68.038236] ACPI Debug:  "=====QUERY_64====="
[   68.050232] ACPI Debug:  "=====QUERY_65====="
[   68.060218] ACPI Debug:  "=====QUERY_64====="
[   68.092216] probe of VPC2004:00 returned 1 after 71386 usecs
[   68.092245] initcall ideapad_acpi_driver_init+0x0/0x1000
[ideapad_laptop] returned 0 after 69751 usecssg

...

These =====QUERY_XX===== messages are from DSDT:

~/acpi$ grep QUERY dsdt.dsl
               Debug = "=====QUERY_11====="
               Debug = "=====QUERY_12====="
               Debug = "=====QUERY_24====="
               Debug = "=====QUERY_25====="
               Debug = "=====QUERY_37====="
               Debug = "=====QUERY_38====="
               Debug = "=====QUERY_64====="
               Debug = "=====QUERY_65====="

Also this is the code from DSDT for QUERY 64 and 65:

...
            Method (_Q64, 0, NotSerialized)  // _Qxx: EC Query
           {
               Debug = "=====QUERY_64====="
               If ((OSYS == 0x07D9))
               {
                   If (((WLEX == One) & (WLAT == One)))
                   {
                       SGOV (0x02040005, One)
                   }
                   Else
                   {
                       SGOV (0x02040005, Zero)
                   }
               }
           }

           Method (_Q65, 0, NotSerialized)  // _Qxx: EC Query
           {
               Debug = "=====QUERY_65====="
               If ((OSYS == 0x07D9))
               {
                   If (((BTEX == One) & (BTAT == One)))
                   {
                       SGOV (0x0202000B, One)
                   }
                   Else
                   {
                       SGOV (0x0202000B, Zero)
                   }
               }
           }

...


Any idea what would cause this ?

BR,

Gabriel C